I'm 80% sure (can't check right now) that Netflix actually has the remastered version that subbed in CGI for the original effects...

They do. It's the Blu-ray version, which redid the effects in CG because they didn't have the original film stock for those.

Funnily enough, TNG used models as well, I don't think it was until Deep Space 9 that they actually started using CGI starships. The versions of the first two Star Treks on Netflix are the remastered versions, so they might be pointing out CGI issues that came up years after the original airing.

https://memory-alpha.fandom.com/wiki/Remaster

DS9 also used models! CGI came with Voyager, notably using Amigas with Video Toaster.

They had been extremely reluctant to use CGI up to that point, despite many efforts to persuade.

https://memory-alpha.fandom.com/wiki/CGI

Babylon 5, which (somewhat infamously) ran at roughly the same time as DS9, was much more aggressive in adopting CGI (also courtesy of Amiga and Video Toaster, I believe) for space stuff, but still used a lot of practical effects for interior shots as well. The CGI ultimately had a negative impact on the DVD and LaserDisc releases. Live action was shot for widescreen, but CGI was only rendered for 4:3 standard-def broadcast. The plan was that if they ever did a widescreen release, they'd re-render the CGI for whatever the target resolution ended up being. But when production ended the assets were lost, and they ended up having to manipulate the standard-def video into a widescreen aspect ratio. This isn't too bad for the pure CGI space stuff, but there are a few composite shots that look awful on the LaserDisc and DVD releases because of it.

I guess sometimes no matter which tech you choose, it ends up being a double-edged sword in one way or another. Especially in the early '90s.

Yes, B5 was an aggressive adopter of digital technology. The driver was costs. Models were expensive, and if they could be replaced by CGI, the cost of making the show could be dramatically reduced. B5 was being produced for the syndication market, which was a different animal than the usual networks, and doing it cheaper while retaining quality was a major goal. Short lived competitor "Space: Above and Beyond (which lasted one season) used models, with production costs over $1,000,000 per episode, and that was a major reason they only lasted a season. B5 did use Amiga and Video Toaster in the beginning, though I believe they transitioned to other equipment later. J. Michael Straczynski's partner Doug Netter had a company called Netter Digital that did the work. JMS commented that when he did pitch meetings with possible networks that would air the show, it was him and a 5 minute clip of their CGI renderings. When I saw the first episode opening, with the Vorlon craft emerging from hyperspace to dock at Babylon 5, I sat back open mouthed going "Whoa". I'm a computer guy, and had some notion of what it took to do that

The Crystalline Entity from 'Datalore' in the first season of TNG was CGI, and was recreated from scratch for the remaster:

https://memory-alpha.fandom.com/wiki/Crystalline_Entity#Back...

These models were at MoPoP in Seattle a while ago, big StarTrek exhibit there.